Tool holder



' W. BADER March l1, 1958 TOOL HOLDER Original Filed May 26, i951 IN VENTOR.

W/L /M BA @ER BY v Afrox/vins United. States, Patent MO.

TOOLv HOLDER 1 Claim. (Cl. 29-96) This invention relates to a toolholder and has particularly to do with that type of holder in which acutting bit is held in place on a tool body by a band-type of holderwhich surrounds the tool on one side and is tensioned to hold the toolin a recess in the body.

Reference is made to applicants United States Patent No. 2,624,103.

This application is a division of my co-pending application Serial No.228,412, led May 26, 1951, now issued August 31, i954, into Patent No.2,687,563.

The invention disclosed in this and the above co-pending applicationconstitutes an improvement over the holding device illustrated in theaforesaid patent.

The object of the present invention is the provision of an adjustmentplate which can be utilized by an operator to determine exact locationfor a tool bit without measurement and prior to assembly of the bit intothe machine. The adjustment devices are removable and replaceable foralteration and substitution. The exact loeating surfaces are providedfor the insert so that by reference between the top plane and the lowerelevating device the insert is accurately positioned.

Drawings accompany the application, and the various views thereof may bebriey described as:

Figure 1, a perspective view of one modification of the invention.

Figure 2, a sectional view on line 2-2 of Figure 1.

Figures 3 and 4, sectional views on lines 3 3 and 4 4 of Figure 2.

Figure 5, a sectional view of a modified construction somewhat similarto that shown in Figure 3.

Figure 6, a second modification showing a tool block in perspective withtwo cutting inserts.

Figures 7, 8 and 9, sectional views on lines 7 7, 8 8 and 9 9,respectively, of Figure 6.

A band holding device for tool inserts of the solid carbide type hasbeen previously described in my Patent No. 2,624,103.

In some installation it has been found that close spacing of two insertsfor cuts which are close together requires that the inserts be mountedon the same tool holder. This same space limitation prevents the use ofthe standard holding construction as shown in the aforesaid patent.

ln the present case, as shown in Figure 1, the inserts are nested inrecesses in a tool body B. The inserts shown at 10 and 12 are more orless in parallel relation, and a band 14 passes around the inserts, theends extending back to a pin 16.

The pin 16 is positioned in a cross bore 18 which, as shown in Figure 4,has an oval cross section to permit shifting of the pin. The ends of thepin have grooves 20 to receive the rear margins of holes in the ends ofthe band 14. The pin 16 is dimensioned to pass through these holes.

Below the tool body B is a base plate 30 which is suitably fastenedrigidly to the body by means not shown.

iCC,

In this base plate a backing-screw 32 passes upwardly at an angle toserve as aA backing` for the insert 10 (see Figure 4);

A similarA construction is used, for insertk12.` A locking screw34isfused for the adjusting screw 32. Also extending upwardly throughthe plate 30- is a threaded pin 36 with a tapered head 38.

Thel head is taperedy in such a way as to have; a suraceparalleling thewall 40vofV the base- B, and thus the band- 14, which is interposedbetween the head38l and the wall 40, is heldtightly4 against the wall.

When a backward thrust is placed against pin 16 by conically ended screw42, shown in Figure 4, pressure is transmitted through each end of theband 14 to the respective inserts 10 and 12.

The anchor post 38 insures tension on the band and prevents an unfoldingaction. With this arrangement the two solid carbide inserts 10 and 12are urged back into the recesses in the body with sufhcient rigiditythat they can perform the cutting operation assigned to them.

in Figure 5 a modification is shown in which the base plate 50 isnecessarily shorter, and a modified anchor post 52 is fastened to theend of the base plate by small bolts 54.

In Figure 6 a block type of insert holder is shown for a certain type ofcutting operation wherein the holder block H rests on a plate when inoperation. With this arrangement all controlling units must be availableabove the base.

Inserts 60 and 62 are held in recesses in the corners of the block by aband 64, the ends of which are anchored by headed screws 66.

As shown best in Figures 7 and 8, a plunger 70 slides in a bore 72. Thisplunger extends transversely of the body and is backed by a spring 74.

The band 64 is perforated centrally thereof and locked to the end of theplunger 70 by a lug 76 and a bolt 78 passing through the lug and theband into the end of the plunger 70.

The surface of the body H adjacent the end of the plunger opening isformed at to receive the lug 76 and the band. Therefore, the plunger maybe moved inwardly into the body by a conically ended screw 82 whichco-operates with a conical recess 84 in the side of the plunger.

As shown in Figure 7, screwing in the small screw 82 will force theplunger back against the spring 74 and draw tight the band 64 againstthe inserts 60 and 62, the ends of the band being securely anchored bythe bolts 66.

Backing screws required for the inserts 60 and 62 are shown at in Figure9 to be controlled by a knurled nut 92 and locked by a screw 94. On thetop of the block H is an adjustment screw plate 96 held in place byscrews 9S. This screw plate has ground corners 100 which positiondirectly adjacent the inserts 60 and 62 and permit finger nailadjustment of the inserts in their outward movement.

The plate 96 may be varied in thickness, depending on which dimension isrequired at the top of the tool. The surfaces ii may be ground to anydesired angle or dimension. It is then possible to have the top of thetool bit exactly flush with the surface 100; and when the operatorachieves this position, he knows that the tool is properly adjusted forcutting without further measurement. If desired, the plate may also becombined with a chip-breaker surface; and it will then perform twofunctions, one of location and the other of providing suitable chipremoval.

I claim:

In a tool holder of the type having an elongate bit recess open at theside and one end and disposed at an' angle to provide Work clearance,and having also means to adjust a bit longitudinally to a proper cuttingposition and means to clamp a bit in said recess, a body having suchelongate open-sided, open-ended recess, and means for positioning a bitin said body comprising a gauge block fastened to said body directlyadjacent said recess, said block being shaped at one edge to correspondwith the walls of the bit insert recess and to form a continuationthereof at the open end, and said block having a surface angled to liein a plane referenced transversely of the axis of said recess whereinsaid plane will align exactly with the top surface of an insert when inproper cutting position relative to said body, and releasable means forfastening said block on said body '4 wherein said block is removable andreplaceable to permit change of said reference plane relative to saidbody without altering the body.

References Cited in the le of this patent UNITED STATES PATENTS

